1
|
Hu J, Tang M, Wang J, Wu Z, Friedrich A, Marder TB. Photocatalyzed Borylcyclopropanation of Alkenes with a (Diborylmethyl)iodide Reagent. Angew Chem Int Ed Engl 2023; 62:e202305175. [PMID: 37527975 DOI: 10.1002/anie.202305175] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/31/2023] [Accepted: 08/01/2023] [Indexed: 08/03/2023]
Abstract
Cyclopropane skeletons play a prominent role in the development of organic synthesis and pharmaceutical chemistry. Herein, we report the design and synthesis of a stable, multifunctional (diborylmethyl)iodide reagent (CHI(Bpin)2 ) for the photoinduced cyclopropanation of alkenes, providing an array of 1,2-substituted cyclopropylboronates in good yields. This α-haloboronic ester can be readily synthesized on a multigram scale from commercially available starting materials. Furthermore, the protocol displays high chemo- and diastereoselectivity, excellent functional-group tolerance, and allows for late-stage borylcyclopropanation of complex molecules. Mechanistic studies reveal that the borylcyclopropanation proceeds through a radical addition/polar cyclization pathway mediated by the photocatalyst fac-Ir(ppy)3 and visible light.
Collapse
Affiliation(s)
- Jiefeng Hu
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816 Jiangsu, China
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074, Würzburg, Germany
| | - Man Tang
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816 Jiangsu, China
| | - Jing Wang
- School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816 Jiangsu, China
| | - Zhu Wu
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074, Würzburg, Germany
| | - Alexandra Friedrich
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074, Würzburg, Germany
| | - Todd B Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074, Würzburg, Germany
| |
Collapse
|
2
|
Gore BS, Wang JJ. Visible-light-induced oxidant/additive-free atom-economic synthesis of multifunctionalized cyclopropanes via energy transfer. Chem Commun (Camb) 2023; 59:5878-5881. [PMID: 37096547 DOI: 10.1039/d3cc01021j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2023]
Abstract
Herein we describe intramolecular cascade reactions enabling the synthesis of bridged cyclopropanes, via the photoinduced energy-transfer catalysis of tethered conjugated dienes. Photocatalysis affords the efficient synthesis of complex tricyclic compounds that exhibit multiple stereocenters from readily accessible starting materials that would otherwise be difficult to obtain. This single-step reaction is characterized by its broad substrate scope, atom-economy, excellent selectivity, and satisfactory yield, which includes a facile scale-up synthesis and synthetic transformation. An in-depth mechanistic study reveals that the reaction proceeds via an energy-transfer pathway.
Collapse
Affiliation(s)
- Babasaheb Sopan Gore
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Sanmin District, Kaohsiung City, 807, Taiwan.
| | - Jeh-Jeng Wang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, No. 100, Shih-Chuan 1st Road, Sanmin District, Kaohsiung City, 807, Taiwan.
- Department of Medical Research, Kaohsiung Medical University Hospital, No. 100, Tzyou 1st Road, Sanmin District, Kaohsiung City, 807, Taiwan
| |
Collapse
|
3
|
Beutner GL, George DT. Opportunities for the Application and Advancement of the Corey–Chaykovsky Cyclopropanation. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Gregory L. Beutner
- Chemical Process Development, Bristol Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - David T. George
- Chemical Process Development, Bristol Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| |
Collapse
|
4
|
He ZY, Ning Y, Zhao YF, Diao HL, Zou P, Wang WB, Shu JS, Xu H. Synthesis of spirocyclopropanes via iodine-promoted bimolecular cyclization of 2-benzylidene 1,3-indandiones. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2146513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Zeng-Yang He
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Yong Ning
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Yu-Fei Zhao
- Marketing Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Hong-Lin Diao
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Peng Zou
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Wen-Bin Wang
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Jun-Sheng Shu
- Technology Center, China Tobacco Anhui Industrial Co., Ltd, Hefei, P. R. China
| | - Hui Xu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, P. R. China
| |
Collapse
|
5
|
Li L, Mayer RJ, Stephenson DS, Mayer P, Ofial AR, Mayr H. Quantification of the Electrophilicities of Diazoalkanes: Kinetics and Mechanism of Azo Couplings with Enamines and Sulfonium Ylides. Chemistry 2022; 28:e202201376. [PMID: 35758555 DOI: 10.1002/chem.202201376] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Indexed: 01/07/2023]
Abstract
Kinetics and mechanism of the reactions of methyl diazoacetate, dimethyl diazomalonate, 4-nitrophenyldiazomethane, and diphenyldiazomethane with sulfonium ylides and enamines were investigated by UV-Vis and NMR spectroscopy. Ordinary alkenes undergo 1,3-dipolar cycloadditions with these diazo compounds. In contrast, sulfonium ylides and enamines attack at the terminal nitrogen of the diazo alkanes to give zwitterions, which undergo various subsequent reactions. As only one new bond is formed in the rate-determining step of these reactions, the correlation lg k2 (20 °C)=sN (N+E) could be used to determine the one-bond electrophilicities E of the diazo compounds from the measured second-order rate constants and the known reactivity indices N and sN of the sulfonium ylides and enamines. The resulting electrophilicity parameters (-21<E<-18), which are 11-14 orders of magnitude smaller than that of the benzenediazonium ion, are used to define the scope of one-bond nucleophiles which may react with these diazoalkanes.
Collapse
Affiliation(s)
- Le Li
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Robert J Mayer
- Institut des Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg & CNRS, 8 Allée Gaspard Monge, 67000, Strasbourg, France
| | - David S Stephenson
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Armin R Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, München, Germany
| |
Collapse
|
6
|
Bagherinejad A, Alizadeh A. A review of the synthetic strategies toward spirobarbiturate-fused 3- to 7-membered rings. Org Biomol Chem 2022; 20:7188-7215. [PMID: 36070341 DOI: 10.1039/d2ob01326f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spiro-connected hexahydropyrimidine-2,4,6-trione heterocyclic rings have received increasing attention from the viewpoint of biological activity and synthetic methods due to the importance of the rigid heterocyclic system and unique orientation of the functional substituents. Since 1900, numerous studies have exploited the synthesis of various spirobarbiturate-fused carbo- and heterocycles by applying different strategies. Due to the importance of barbiturate-based olefins as activated alkenes, these substrates have been utilized in many reactions. In addition, the nucleophilic addition of 1,3-disubstituted barbituric acid to different electrophiles has been applied to prepare highly functionalized spirobarbiturate scaffolds. This short review highlights various strategies for synthesizing spirobarbiturate-fused 3- to 7-membered carbo- and heterocyclic rings and some catalytic diastereoselective and enantioselective chemical reactions to access chiral compounds. The sections are divided by the incorporation of 3- to 7-membered heterocyclic or carbocyclic rings into a spirobarbiturate scaffold, and are presented in different subsections depending on the mechanistic details.
Collapse
Affiliation(s)
- Akram Bagherinejad
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| | - Abdolali Alizadeh
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| |
Collapse
|
7
|
Zhang J, Song X, Chen ZC, Du W, Chen YC. Phosphine-catalysed intermolecular cyclopropanation reaction between benzyl bromides and activated alkenes. NEW J CHEM 2022. [DOI: 10.1039/d2nj03417d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While phosphine-mediated reactions have been extensively explored over the past decades, the catalytic cyclopropanation reaction via a phosphonium ylide pathway has been significantly underdeveloped, and an intermolecular version still remains...
Collapse
|
8
|
Pathak D, Deuri S, Phukan P. Nucleophilicity and CO2 fixation ability of phosphorus, nitrogen and sulfur ylides: insights on stereoelectronic factors from DFT study. J CHEM SCI 2021. [DOI: 10.1007/s12039-021-01983-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
9
|
Zhou Y, Li N, Cai W, Huang Y. Asymmetric Sequential Corey-Chaykovsky Cyclopropanation/Cloke-Wilson Rearrangement for the Synthesis of 2,3-Dihydrofurans. Org Lett 2021; 23:8755-8760. [PMID: 34734727 DOI: 10.1021/acs.orglett.1c03225] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The first sequential Corey-Chaykovsky cyclopropanation/Cloke-Wilson rearrangement between propargyl sulfonium salts and acrylonitrile derivatives has been developed, affording the tetra-substituted 2,3-dihydrofurans in generally excellent yields (57-98%) with good diastereoselectivities (7:1-18:1). In addition, chiral propargyl sulfonium salt is also suitable for this strategy, giving the optically active 2,3-dihydrofurans with good enantioselectivities. This reaction sequence was designed upon in situ generated 10π-conjugated structures from the dearomatization of indole fragments and subsequent intramolecular 1,6-addition.
Collapse
Affiliation(s)
- Yiming Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ning Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Wei Cai
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - You Huang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| |
Collapse
|
10
|
Qiu F, Cao Y, Zeng L, Zhang C, Fu L, Zhang J, Zhu H, Shao J. (2 + 1 + 1 + 1)-Annulation Reactions of Aryldiazonium Tetrafluoroborates with Sulfur Ylides to Polysubstituted Pyrazoles. J Org Chem 2021; 86:8997-9006. [PMID: 34132524 DOI: 10.1021/acs.joc.1c00949] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Novel divergent domino annulation reactions of sulfur ylides with aryldiazonium tetrafluoroborates have been developed, affording various tetra- and trisubstituted pyrazole derivatives in moderate to good yields. Three molecules of sulfur ylides were applied as C1 synthon to construct the complex products with five new chemical bonds formed in these one-pot reactions.
Collapse
Affiliation(s)
- Fengkai Qiu
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Yu Cao
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Linghui Zeng
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| | - Chong Zhang
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| | - Liping Fu
- Department of Pharmacy, Shaoxing Hospital of Traditional Chinese Medicine, Shaoxing, 312000, P. R. China
| | - Jiankang Zhang
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| | - Huajian Zhu
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| | - Jiaan Shao
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| |
Collapse
|
11
|
Orlandi M, Escudero-Casao M, Licini G. Nucleophilicity Prediction via Multivariate Linear Regression Analysis. J Org Chem 2021; 86:3555-3564. [PMID: 33534569 PMCID: PMC7901016 DOI: 10.1021/acs.joc.0c02952] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
![]()
The concept of nucleophilicity is
at the basis of most transformations
in chemistry. Understanding and predicting the relative reactivity
of different nucleophiles is therefore of paramount importance. Mayr’s
nucleophilicity scale likely represents the most complete collection
of reactivity data, which currently includes over 1200 nucleophiles.
Several attempts have been made to theoretically predict Mayr’s
nucleophilicity parameters N based on calculation
of molecular properties, but a general model accounting for different
classes of nucleophiles could not be obtained so far. We herein show
that multivariate linear regression analysis is a suitable tool for
obtaining a simple model predicting N for virtually
any class of nucleophiles in different solvents for a set of 341 data
points. The key descriptors of the model were found to account for
the proton affinity, solvation energies, and sterics.
Collapse
Affiliation(s)
- Manuel Orlandi
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.,CIRCC-Consorzio Interuniversitario per le Reattività Chimiche e la Catalisi, Padova Unit, via Marzolo 1, 35131 Padova, Italy
| | - Margarita Escudero-Casao
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.,CIRCC-Consorzio Interuniversitario per le Reattività Chimiche e la Catalisi, Padova Unit, via Marzolo 1, 35131 Padova, Italy
| | - Giulia Licini
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy.,CIRCC-Consorzio Interuniversitario per le Reattività Chimiche e la Catalisi, Padova Unit, via Marzolo 1, 35131 Padova, Italy
| |
Collapse
|
12
|
Mayer RJ, Allihn PWA, Hampel N, Mayer P, Sieber SA, Ofial AR. Electrophilic reactivities of cyclic enones and α,β-unsaturated lactones. Chem Sci 2021; 12:4850-4865. [PMID: 34163736 PMCID: PMC8179571 DOI: 10.1039/d0sc06628a] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The reactivities of cyclic enones and α,β-unsaturated lactones were characterized by following the kinetics of their reactions with colored carbon-centered reference nucleophiles in DMSO at 20 °C. The experimentally determined second-order rate constants k2 were analyzed with the Mayr–Patz equation, lg k = sN(N + E), to furnish the electrophilicity descriptors E for the Michael acceptors. Cyclic enones and lactones show different reactivity trends than their acyclic analogs. While cyclization reduces the reactivity of enones slightly, α,β-unsaturated lactones are significantly more reactive Michael acceptors than analogously substituted open-chain esters. The observed reactivity trends were rationalized through quantum-chemically calculated Gibbs energy profiles (at the SMD(DMSO)/M06-2X/6-31+G(d,p) level of theory) and distortion interaction analysis for the reactions of the cyclic Michael acceptors with a sulfonium ylide. The electrophilicities of simplified electrophilic fragments reflect the general reactivity pattern of structurally more complex terpene-derived cyclic enones and sesquiterpene lactones, such as parthenolide. Different reactivity trends for cyclic and acyclic Michael acceptors were found within the framework of Mayr's experimental reactivity scales and analyzed through quantum-chemical studies.![]()
Collapse
Affiliation(s)
- Robert J Mayer
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Patrick W A Allihn
- Department Chemie, Technische Universität München Lichtenbergstraße 4 85748 Garching Germany
| | - Nathalie Hampel
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| | - Stephan A Sieber
- Department Chemie, Technische Universität München Lichtenbergstraße 4 85748 Garching Germany
| | - Armin R Ofial
- Department Chemie, Ludwig-Maximilians-Universität München Butenandtstr. 5-13 81377 München Germany
| |
Collapse
|
13
|
Huang J, Sun S, Ma P, Wang J, Lee K, Xing Y, Wu Y, Wang G. Highly diastereoselective spiro-cyclopropanation of 2-arylidene-1,3-indanediones and dimethylsulfonium ylides. NEW J CHEM 2021. [DOI: 10.1039/d1nj02886c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
High diastereoselectivity, mild conditions and excellent functional group compatibility.
Collapse
Affiliation(s)
- Jie Huang
- School of Pharmacy, Hubei University of Science and Technology, Xianning 437100, China
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, Hubei University of Science and Technology, Xianning 437100, China
- Xianning Engineering Research Center for Healthy Environment, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, 437100, China
| | - Shaofa Sun
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, Hubei University of Science and Technology, Xianning 437100, China
| | - Ping Ma
- Xianning Engineering Research Center for Healthy Environment, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, 437100, China
| | - Jian Wang
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, Hubei University of Science and Technology, Xianning 437100, China
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China
| | - Kevin Lee
- Department of Chemistry, William Paterson University of New Jersey, 300 Pompton Road, Wayne, New Jersey 07470, USA
| | - Yalan Xing
- Department of Chemistry, William Paterson University of New Jersey, 300 Pompton Road, Wayne, New Jersey 07470, USA
| | - Yang Wu
- Xianning Engineering Research Center for Healthy Environment, School of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, 437100, China
| | - Gangqiang Wang
- Hubei Key Laboratory of Radiation Chemistry and Functional Materials, Non-power Nuclear Technology Collaborative Innovation Center, Hubei University of Science and Technology, Xianning 437100, China
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| |
Collapse
|
14
|
Puet A, Domínguez G, Cañada FJ, Pérez-Castells J. Amino Acid-Based Synthesis and Glycosidase Inhibition of Cyclopropane-Containing Iminosugars. ACS OMEGA 2020; 5:31821-31830. [PMID: 33344836 PMCID: PMC7745444 DOI: 10.1021/acsomega.0c04589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 10/29/2020] [Indexed: 05/04/2023]
Abstract
Synthesis of four iminosugars fused to a cyclopropane ring is described using l-serine as the chiral pool. The key steps are large-scale preparation of an α,β-unsaturated piperidinone followed by completely stereoselective sulfur ylide cyclopropanation. Stereochemistry of compounds has been studied by nuclear Overhauser effect spectroscopy (NOESY) experiments and 1H homonuclear decoupling to measure constant couplings. The activity of these compounds against different glycosidases has been evaluated. Although inhibition activity was low (compound 8a presents a (K i) of 1.18 mM against β-galactosidase from Escherichia coli), interestingly, we found that compounds 8a and 8b increase the activity of neuraminidase from Vibrio cholerae up to 100%.
Collapse
Affiliation(s)
- Alejandro Puet
- Department
of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28668 Boadilla del Monte, Madrid, Spain
| | - Gema Domínguez
- Department
of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28668 Boadilla del Monte, Madrid, Spain
| | - F. Javier Cañada
- Dep.
Biología FisicoQuímica, CIB
Margarita Salas, CSIC,
C/Ramiro de Maetzu 9, 28040 Madrid, Spain
- CIBER
de Enfermedades Respiratorias (CIBERES), Avda, Monforte de Lemos 3-5, 28029 Madrid, Spain
| | - Javier Pérez-Castells
- Department
of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Urbanización Montepríncipe, 28668 Boadilla del Monte, Madrid, Spain
- E-mail:
| |
Collapse
|
15
|
Ikeda H, Nishi K, Tsurugi H, Mashima K. Chromium-catalyzed cyclopropanation of alkenes with bromoform in the presence of 2,3,5,6-tetramethyl-1,4-bis(trimethylsilyl)-1,4-dihydropyrazine. Chem Sci 2020; 11:3604-3609. [PMID: 34094048 PMCID: PMC8152687 DOI: 10.1039/d0sc00964d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 03/04/2020] [Indexed: 12/20/2022] Open
Abstract
Chromium-catalyzed cyclopropanation of alkenes with bromoform was achieved to produce the corresponding bromocyclopropanes. In this catalytic cyclopropanation, an organosilicon reductant, 2,3,5,6-tetramethyl-1,4-bis(trimethylsilyl)-1,4-dihydropyrazine (1a), was indispensable for reducing CrCl3(thf)3 to CrCl2(thf)3, as well as for in situ generation of (bromomethylidene)chromium(iii) species from (dibromomethyl)chromium(iii) species. The (bromomethylidene)chromium(iii) species are proposed to react spontaneously with alkenes to give the corresponding bromocyclopropanes. This catalytic cyclopropanation was applied to various olefinic substrates, such as allyl ethers, allyl esters, terminal alkenes, and cyclic alkenes.
Collapse
Affiliation(s)
- Hideaki Ikeda
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Kohei Nishi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Hayato Tsurugi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| |
Collapse
|
16
|
Kazia A, Melngaile R, Mishnev A, Veliks J. Johnson-Corey-Chaykovsky fluorocyclopropanation of double activated alkenes: scope and limitations. Org Biomol Chem 2020; 18:1384-1388. [PMID: 31998934 DOI: 10.1039/c9ob02712b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Johnson-Corey-Chaykovsky fluorocyclopropanation of double activated alkenes utilizing S-monofluoromethyl-S-phenyl-2,3,4,5-tetramethylphenylsulfonium tetrafluoroborate is an efficient approach to obtain a range of monofluorocyclopropane derivatives. So far, fluoromethylsulfonium salts have displayed the broadest scope for direct fluoromethylene transfer. In contrast to more commonly used fluorohalomethanes or freon derivatives, diarylfluoromethylsulfonium salts are bench stable, easy-to use reagents useful for the direct transfer of a fluoromethylene group to alkenes giving access to the challenging products - fluorocyclopropane derivatives. Interplay between the reactivity of the starting materials and stability of the fluorocyclopropanes formed determines the outcome of the process.
Collapse
Affiliation(s)
- Armands Kazia
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga LV-1006, Latvia.
| | | | | | | |
Collapse
|
17
|
Chen W, Luo F, Wu Y, Cen J, Shao J, Yu Y. Efficient access to fluorescent benzofuro[3,2-b]carbazoles via TFA-promoted cascade annulations of sulfur ylides, 2-hydroxy-β-nitrostyrenes and indoles. Org Chem Front 2020. [DOI: 10.1039/d0qo00137f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, TFA-promoted cascade annulation of sulfur ylides, 2-hydroxy-β-nitrostyrenes and indoles was established.
Collapse
Affiliation(s)
- Wenteng Chen
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou
- P. R. China
| | - Feng Luo
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou
- P. R. China
| | - You Wu
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou
- P. R. China
| | - Jie Cen
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou
- P. R. China
| | - Jiaan Shao
- School of Medicine
- Zhejiang University City College
- Hangzhou
- P. R. China
| | - Yongping Yu
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou
- P. R. China
| |
Collapse
|
18
|
Mayer RJ, Ofial AR. Nucleophilie von Glutathion als Bindeglied zur Reaktivität von Michael‐Akzeptoren. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Robert J. Mayer
- Department ChemieLudwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Deutschland
| | - Armin R. Ofial
- Department ChemieLudwig-Maximilians-Universität München Butenandtstraße 5–13 81377 München Deutschland
| |
Collapse
|
19
|
Mayer RJ, Ofial AR. Nucleophilicity of Glutathione: A Link to Michael Acceptor Reactivities. Angew Chem Int Ed Engl 2019; 58:17704-17708. [PMID: 31560405 PMCID: PMC6899611 DOI: 10.1002/anie.201909803] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Indexed: 12/22/2022]
Abstract
Deprotonated glutathione is among the most potent biological nucleophiles and plays an important physiological role in cellular detoxification by forming covalent conjugates with Michael acceptors. The electrophilicity E of various Michael acceptors was characterized recently according to the Patz-Mayr relation lg k2 =sN (N+E). We now determined the nucleophilic reactivity (N, sN ) of glutathione (GSH) in aqueous solution at 20 °C to connect published GSH reactivities (kGSH ) with Mayr's electrophilicity scale (E). In this way, electrophilicities E of more than 70 Michael acceptors could be estimated, which can now be used to systematically predict novel reactions with the multitude of nucleophiles whose nucleophilicity parameters N/sN are known.
Collapse
Affiliation(s)
- Robert J. Mayer
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstraße 5–1381377MünchenGermany
| | - Armin R. Ofial
- Department ChemieLudwig-Maximilians-Universität MünchenButenandtstraße 5–1381377MünchenGermany
| |
Collapse
|
20
|
Milligan JA, Burns KL, Le AV, Polites VC, Wang ZJ, Molander GA, Kelly CB. Radical-Polar Crossover Annulation: A Platform for Accessing Polycyclic Cyclopropanes. Adv Synth Catal 2019; 362:242-247. [PMID: 34084099 DOI: 10.1002/adsc.201901051] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Photoredox-mediated radical/polar crossover (RPC) processes provide unique solutions to challenging annulations. Herein, we describe an approach to the cyclopropanation of olefins that are embedded within bicyclic scaffolds. Whereas these systems are notoriously recalcitrant toward classical cyclopropanation approaches, RPC cyclopropanation can be executed with ease, leading to polycarbocyclic and polyheterocyclic cyclopropanes. The cyclopropanation proceeds through a photoredox-enabled Giese-type radical addition followed by an intramolecular anionic substitution reaction on a neopentyl leaving group.
Collapse
Affiliation(s)
- John A Milligan
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
| | - Kevin L Burns
- Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, P.O. Box 842006, Richmond, Virginia 23284, USA.,Medicines for All Institute, Virginia Commonwealth University, Biotech 8, 737 North Fifth Street, Richmond, Virginia, 23219, USA
| | - Anthony V Le
- Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, P.O. Box 842006, Richmond, Virginia 23284, USA.,Medicines for All Institute, Virginia Commonwealth University, Biotech 8, 737 North Fifth Street, Richmond, Virginia, 23219, USA
| | - Viktor C Polites
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
| | - Zheng-Jun Wang
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA.,State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 41000, China
| | - Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
| | - Christopher B Kelly
- Department of Chemistry, Virginia Commonwealth University, 1001 West Main Street, P.O. Box 842006, Richmond, Virginia 23284, USA.,Medicines for All Institute, Virginia Commonwealth University, Biotech 8, 737 North Fifth Street, Richmond, Virginia, 23219, USA
| |
Collapse
|
21
|
Shao J, Chen W, Ying Z, Liu S, Luo F, Ou L. Sulfur Ylide Initiated [4 + 1]/[4 + 2] Annulation Reactions: A One-Pot Approach to Dibenzofuran Acrylate Derivatives. Org Lett 2019; 21:6370-6373. [DOI: 10.1021/acs.orglett.9b02260] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiaan Shao
- School of Medicine, Zhejiang University City College, Hangzhou, 310015, P. R. China
| | - Wenteng Chen
- College of Pharmaceutical Science, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Zhimin Ying
- College of Pharmaceutical Science, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Shuangrong Liu
- College of Pharmaceutical Science, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Feng Luo
- College of Pharmaceutical Science, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Lili Ou
- Hangzhou Zhongmei Huadong Pharmaceutical Co., Ltd., Hangzhou, 310011, P. R. China
| |
Collapse
|
22
|
Triandafillidi I, Savvidou A, Kokotos CG. Synthesis of γ-Lactones Utilizing Ketoacids and Trimethylsulfoxonium Iodide. Org Lett 2019; 21:5533-5537. [PMID: 31282685 DOI: 10.1021/acs.orglett.9b01852] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The Johnson-Corey-Chaykovsky epoxidation is one of the oldest methods for the synthesis of terminal epoxides from carbonyl compounds. Herein we present a simplified extension of the Johnson-Corey-Chaykovsky epoxidation, where ketoacids are employed as the substrates and commercially available trimethylsulfoxonium iodide is employed as the carbon-atom homologating reagent. A variety of lactones are produced in a single step in synthetically useful yields.
Collapse
Affiliation(s)
- Ierasia Triandafillidi
- Laboratory of Organic Chemistry, Department of Chemistry , National and Kapodistrian University of Athens , Panepistimiopolis , Athens 15771 , Greece
| | - Anatoli Savvidou
- Laboratory of Organic Chemistry, Department of Chemistry , National and Kapodistrian University of Athens , Panepistimiopolis , Athens 15771 , Greece
| | - Christoforos G Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry , National and Kapodistrian University of Athens , Panepistimiopolis , Athens 15771 , Greece
| |
Collapse
|
23
|
Pierrot D, Rajzmann M, Carissan Y, Rodriguez J, Bonne D, Coquerel Y. Experimental and theoretical studies of (4 + 1) annulations between α‐oxoketenes and stable phosphorous, nitrogen, or sulfur ylides. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- David Pierrot
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| | - Michel Rajzmann
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| | - Yannick Carissan
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| | - Jean Rodriguez
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| | - Damien Bonne
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| | - Yoann Coquerel
- Aix Marseille Université, CNRS, Centrale Marseille, iSm2 Marseille France
| |
Collapse
|
24
|
Nambu H, Onuki Y, Ono N, Tsuge K, Yakura T. Ring-opening cyclization of spirocyclopropanes with stabilized sulfonium ylides for the construction of a chromane skeleton. Chem Commun (Camb) 2019; 55:6539-6542. [PMID: 31106310 DOI: 10.1039/c9cc03023a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Regioselective ring-opening cyclization of cyclohexane-1,3-dione-2-spirocyclopropanes with stabilized sulfonium ylides provided 2,3-trans-disubstituted 2,3,4,6,7,8-hexahydro-5H-1-benzopyran-5-ones in high yields without the formation of any isomers. The obtained product was readily converted into highly substituted chromane.
Collapse
Affiliation(s)
- Hisanori Nambu
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama 930-0194, Japan.
| | - Yuta Onuki
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama 930-0194, Japan.
| | - Naoki Ono
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama 930-0194, Japan.
| | - Kiyoshi Tsuge
- Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama 930-8555, Japan
| | - Takayuki Yakura
- Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Sugitani, Toyama 930-0194, Japan.
| |
Collapse
|
25
|
Cyr P, Flynn-Robitaille J, Boissarie P, Marinier A. Mild and Diazo-Free Synthesis of Trifluoromethyl-Cyclopropanes Using Sulfonium Ylides. Org Lett 2019; 21:2265-2268. [PMID: 30883143 DOI: 10.1021/acs.orglett.9b00557] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The synthesis of several 1,1-disubstituted trifluoromethyl-cyclopropanes (TFCPs), known as tert-butyl bioisosteres, has been achieved from the reaction between trifluoromethylalkenes and unstabilized sulfonium ylides in yields of ≤97%. This method offers practical access to this cyclopropyl moiety of pharmacological interest, employing a commercially available reagent at low temperatures. The synthesis of cyclopropanes bearing other electron-withdrawing groups as well as trisubstituted TFCPs was also accomplished.
Collapse
Affiliation(s)
- Patrick Cyr
- Medicinal Chemistry, Institute of Research in Immunology and Cancer , Université de Montréal , Montreal , QC H3C 3J7 , Canada
| | - Joël Flynn-Robitaille
- Medicinal Chemistry, Institute of Research in Immunology and Cancer , Université de Montréal , Montreal , QC H3C 3J7 , Canada
| | - Patrick Boissarie
- Medicinal Chemistry, Institute of Research in Immunology and Cancer , Université de Montréal , Montreal , QC H3C 3J7 , Canada
| | - Anne Marinier
- Medicinal Chemistry, Institute of Research in Immunology and Cancer , Université de Montréal , Montreal , QC H3C 3J7 , Canada.,Département de chimie, Faculté des Arts et Sciences , Université de Montréal , Montreal , QC H3C 3J7 , Canada.,Département de pharmacologie, Faculté de Médecine , Université de Montréal , Montreal , QC H3C 3J7 , Canada
| |
Collapse
|
26
|
Yan X, Shao P, Song X, Zhang C, Lu C, Liu S, Li Y. Chemoselective syntheses of spirodihydrofuryl and spirocyclopropyl barbiturates via cascade reactions of barbiturate-based olefins and acetylacetone. Org Biomol Chem 2019; 17:2684-2690. [PMID: 30768085 DOI: 10.1039/c9ob00004f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Michael addition initiated ring closure reaction of barbiturate-based olefins and acetylacetone with NBS has been explored. The efficient and chemoselective approach for the synthesis of barbiturate-fused spirocycles was established. Spirodihydrofuryl barbiturates and spirocyclopropyl barbiturates were synthesized selectively via cascade reactions under different basic conditions in moderate to excellent yields. The structure of 2-(4-chlorophenyl)-1,1-diacetyl-5,7-dimethyl-5,7-diazaspiro[2,5]octane-4,6,8-trione was confirmed by single crystal X-ray diffraction analysis.
Collapse
Affiliation(s)
- Xuebin Yan
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China.
| | | | | | | | | | | | | |
Collapse
|
27
|
Veliks J, Kazia A. Fluoromethylene Transfer from Diarylfluoromethylsulfonium Salts: Synthesis of Fluorinated Epoxides. Chemistry 2019; 25:3786-3789. [PMID: 30681208 DOI: 10.1002/chem.201900349] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Indexed: 01/17/2023]
Abstract
Diarylfluoromethyl sulfonium salts are efficient fluoromethylene transfer reagents equivalent to fluorocarbene, which is difficult to access. This was demonstrated by the development of a monofluorinated Johnson-Corey-Chaykovsky reaction with ketones and aldehydes, delivering uncommon 2-unsubstituted fluoroepoxides. This is the first evidence for the feasibility of sulfur fluoromethylylide and its action as a reaction intermediate.
Collapse
Affiliation(s)
- Janis Veliks
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
| | - Armands Kazia
- Latvian Institute of Organic Synthesis, Aizkraukles 21, LV-1006, Riga, Latvia
| |
Collapse
|
28
|
Varshnaya RK, Banerjee P. Lewis Acid-Catalyzed [3+3] Annulation of Donor–Acceptor Cyclopropanes and Indonyl Alcohols: One Step Synthesis of Substituted Carbazoles with Promising Photophysical Properties. J Org Chem 2019; 84:1614-1623. [DOI: 10.1021/acs.joc.8b02733] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Rohit Kumar Varshnaya
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India
| | - Prabal Banerjee
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab 140001, India
| |
Collapse
|
29
|
Xiang Y, Fan X, Cai PJ, Yu ZX. Understanding Regioselectivities of Corey-Chaykovsky Reactions of Dimethylsulfoxonium Methylide (DMSOM) and Dimethylsulfonium Methylide (DMSM) toward Enones: A DFT Study. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801216] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yu Xiang
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Xing Fan
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Pei-Jun Cai
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| | - Zhi-Xiang Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS); Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education; College of Chemistry; Peking University; 100871 Beijing China
| |
Collapse
|
30
|
Shen Y, Chai J, Yang G, Chen W, Chai Z. Stereocontrolled Synthesis of trans/cis-2,3-Disubstituted Cyclopropane-1,1-diesters and Applications in the Syntheses of Furanolignans. J Org Chem 2018; 83:12549-12558. [DOI: 10.1021/acs.joc.8b01798] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yue Shen
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
- Traditional Chinese Medicine College, Bozhou University, Bozhou, Anhui 236800, China
| | - Jun Chai
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Gaosheng Yang
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Wenlong Chen
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Zhuo Chai
- Key Laboratory of Functionalized Molecular Solids, Ministry of Education, Anhui Key Laboratory of Molecule-Based Materials (State Key Laboratory Cultivation Base), College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| |
Collapse
|
31
|
Jankins TC, Fayzullin RR, Khaskin E. Three-Component [1 + 1 + 1] Cyclopropanation with Ruthenium(II). Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00361] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Tanner C. Jankins
- Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0412, Japan
| | - Robert R. Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street, 8, Kazan 420088, Russian Federation
| | - Eugene Khaskin
- Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0412, Japan
| |
Collapse
|
32
|
Li QZ, Zhang X, Zeng R, Dai QS, Liu Y, Shen XD, Leng HJ, Yang KC, Li JL. Direct Sulfide-Catalyzed Enantioselective Cyclopropanations of Electron-Deficient Dienes and Bromides. Org Lett 2018; 20:3700-3704. [DOI: 10.1021/acs.orglett.8b01537] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qing-Zhu Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Xiang Zhang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Rong Zeng
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Qing-Song Dai
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Yue Liu
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Xu-Dong Shen
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Hai-Jun Leng
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Kai-Chuan Yang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
| | - Jun-Long Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu 610052, China
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| |
Collapse
|
33
|
Wu G, Wu Q. A Domino Reaction of Pyridinium Salts: Efficient Synthesis of 4,5‐Disubstituted 1,2,3‐(
NH
)‐Triazoles. ChemistrySelect 2018. [DOI: 10.1002/slct.201800669] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Guang‐Long Wu
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology, No 8, Liangxiang Donglu Beijing 102488 China
| | - Qin‐Pei Wu
- School of Chemistry and Chemical EngineeringBeijing Institute of Technology, No 8, Liangxiang Donglu Beijing 102488 China
| |
Collapse
|
34
|
Shen J, Yang Y, Hou X, Zeng W, Yu A, Zhao X, Meng X. Darzens reaction of thioisatins and sulfonium salts: approach to the synthesis of thiochromenone derivatives with anticancer potency. Org Biomol Chem 2018; 16:3487-3494. [PMID: 29691546 DOI: 10.1039/c8ob00402a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new Darzens reaction of thioisatins and sulfonium salts has, for the first time, been reported. This reaction allows efficient access to thiochromenone derivatives in good to excellent yields under mild reaction conditions. The substrate scope includes both electron-withdrawing and electron-donating groups on both the thioisatins and sulfonium salts. Moreover, some of the synthesized thiochromenone derivatives have been found to show potent anticancer activities against six different cancer cell lines using the methylthiazoltetrazolium (MTT) assay.
Collapse
Affiliation(s)
- Jinhui Shen
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China.
| | | | | | | | | | | | | |
Collapse
|
35
|
Li Z, Jangra H, Chen Q, Mayer P, Ofial AR, Zipse H, Mayr H. Kinetics and Mechanism of Oxirane Formation by Darzens Condensation of Ketones: Quantification of the Electrophilicities of Ketones. J Am Chem Soc 2018; 140:5500-5515. [PMID: 29659264 DOI: 10.1021/jacs.8b01657] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The kinetics of epoxide formation by Darzens condensation of aliphatic ketones 1 with arylsulfonyl-substituted chloromethyl anions 2 (ArSO2CHCl-) have been determined photometrically in DMSO solution at 20 °C. The reactions proceed via nucleophilic attack of the carbanions at the carbonyl group to give intermediate halohydrin anions 4, which subsequently cyclize with formation of the oxiranes 3. Protonation of the reaction mixture obtained in THF solution at low temperature allowed the intermediates to be trapped and the corresponding halohydrins 4-H to be isolated. Crossover experiments, i.e., deprotonation of the halohydrins 4-H in the presence of a trapping reagent for the regenerated arylsulfonyl-substituted chloromethyl anions 2, provided the relative rates of backward ( k-CC) and ring closure ( krc) reactions of the intermediates. Combination of the kinetic data ( k2exptl) with the splitting ratio ( k-CC/ krc) gave the second-order rate constants kCC for the attack of the carbanions 2 at the ketones 1. These kCC values and the previously reported reactivity parameters N and sN for the arylsulfonyl-substituted chloromethyl anions 2 allowed us to use the linear free energy relationship log k2(20 °C) = sN( N + E) for deriving the electrophilicity parameters E of the ketones 1 and thus predict potential nucleophilic reaction partners. Density functional theory calculations of the intrinsic reaction pathways showed that the reactions of the ketones 1 with the chloromethyl anions 2 yield two rotational isomers of the intermediate halohydrin anions 4, only one of which can cyclize while the other undergoes retroaddition because the barrier for rotation is higher than that for reversal to the reactants 1 and 2. The electrophilicity parameters E correlate moderately with the lowest unoccupied molecular orbital energies of the carbonyl groups, very poorly with Parr's electrophilicity indices, and best with the methyl anion affinities calculated for DMSO solution.
Collapse
Affiliation(s)
- Zhen Li
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Harish Jangra
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Quan Chen
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Peter Mayer
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Armin R Ofial
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Hendrik Zipse
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| | - Herbert Mayr
- Department Chemie , Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13 , 81377 München , Germany
| |
Collapse
|
36
|
Wu GL, Wu QP. Metal-Free Multicomponent Reaction for Synthesis of 4,5-Disubstituted 1,2,3-(NH
)-Triazoles. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701587] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Guang-Long Wu
- School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 People's Republic of China
| | - Qin-Pei Wu
- School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 People's Republic of China
| |
Collapse
|
37
|
Allgäuer DS, Jangra H, Asahara H, Li Z, Chen Q, Zipse H, Ofial AR, Mayr H. Quantification and Theoretical Analysis of the Electrophilicities of Michael Acceptors. J Am Chem Soc 2017; 139:13318-13329. [PMID: 28921959 DOI: 10.1021/jacs.7b05106] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In order to quantify the electrophilic reactivities of common Michael acceptors, we measured the kinetics of the reactions of monoacceptor-substituted ethylenes (H2C═CH-Acc, 1) and styrenes (PhCH═CH-Acc, 2) with pyridinium ylides 3, sulfonium ylide 4, and sulfonyl-substituted chloromethyl anion 5. Substitution of the 57 measured second-order rate constants (log k) and the previously reported nucleophile-specific parameters N and sN for 3-5 into the correlation log k = sN(E + N) allowed us to calculate 15 new empirical electrophilicity parameters E for Michael acceptors 1 and 2. The use of the same parameters sN, N, and E for these different types of reactions shows that all reactions proceed via a common rate-determining step, the nucleophilic attack of 3-5 at the Michael acceptors with formation of acyclic intermediates, which subsequently cyclize to give tetrahydroindolizines (stepwise 1,3-dipolar cycloadditions with 3) and cyclopropanes (with 4 and 5), respectively. The electrophilicity parameters E thus determined can be used to calculate the rates of the reactions of Michael acceptors 1 and 2 with any nucleophile of known N and sN. DFT calculations were performed to confirm the suggested reaction mechanisms and to elucidate the origin of the electrophilic reactivities. While electrophilicities E correlate poorly with the LUMO energies and with Parr's electrophilicity index ω, good correlations were found between the experimentally observed electrophilic reactivities of 44 Michael acceptors and their calculated methyl anion affinities, particularly when solvation by dimethyl sulfoxide was taken into account by applying the SMD continuum solvation model. Because of the large structural variety of Michael acceptors considered for these correlations, which cover a reactivity range of 17 orders of magnitude, we consider the calculation of methyl anion affinities to be the method of choice for a rapid estimate of electrophilic reactivities.
Collapse
Affiliation(s)
- Dominik S Allgäuer
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Harish Jangra
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Haruyasu Asahara
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Zhen Li
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Quan Chen
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Hendrik Zipse
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Armin R Ofial
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München , Butenandtstrasse 5-13, 81377 München, Germany
| |
Collapse
|
38
|
Spencer JA, Jamieson C, Talbot EPA. One-Pot, Three-Step Synthesis of Cyclopropylboronic Acid Pinacol Esters from Synthetically Tractable Propargylic Silyl Ethers. Org Lett 2017; 19:3891-3894. [DOI: 10.1021/acs.orglett.7b01778] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan A. Spencer
- University of Strathclyde, 295 Cathedral
Street, Glasgow G1 1XL, U.K
- GlaxoSmithKline, Gunnels
Wood Road, Stevenage, Herts SG1 2NY, U.K
| | - Craig Jamieson
- University of Strathclyde, 295 Cathedral
Street, Glasgow G1 1XL, U.K
| | | |
Collapse
|
39
|
Nie BJ, Wu LH, Hu RF, Sun Y, Wu J, He P, Huang NY. Synthesis of cyclopropa[c]indeno[1,2-b]quinolines through a MCR/Staudinger/aza-Wittig sequence. SYNTHETIC COMMUN 2017. [DOI: 10.1080/00397911.2017.1328065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Bing-Jie Nie
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Li-Hui Wu
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Ruo-Fei Hu
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Yang Sun
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Jing Wu
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Ping He
- College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang, Hubei, China
| | - Nian-Yu Huang
- Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, Hubei, China
| |
Collapse
|
40
|
López‐Rodríguez A, Domínguez G, Pérez‐Castells J. Microwave‐Mediated Sulfonium Ylide Cyclopropanation. Stereoselective Synthesis of Cyclopropa[c]pentalenes. ChemistrySelect 2017. [DOI: 10.1002/slct.201700432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alberto López‐Rodríguez
- Facultad de FarmaciaDpto. Química y BioquímicaUniversidad San Pablo CEU, Urb. Montepríncipe, Boadilla del Monte 28668 Madrid
| | - Gema Domínguez
- Facultad de FarmaciaDpto. Química y BioquímicaUniversidad San Pablo CEU, Urb. Montepríncipe, Boadilla del Monte 28668 Madrid
| | - Javier Pérez‐Castells
- Facultad de FarmaciaDpto. Química y BioquímicaUniversidad San Pablo CEU, Urb. Montepríncipe, Boadilla del Monte 28668 Madrid
| |
Collapse
|
41
|
Li Z, Chen Q, Mayer P, Mayr H. Nucleophilicity Parameters of Arylsulfonyl-Substituted Halomethyl Anions. J Org Chem 2017; 82:2011-2017. [DOI: 10.1021/acs.joc.6b02844] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhen Li
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
| | - Quan Chen
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
| |
Collapse
|
42
|
Meng XS, Jiang S, Xu XY, Wu QX, Gu YC, Shi DQ. Stabilized Sulfur Ylide Mediated Cyclopropanations and Formal [4+1] Cycloadditions of 3-Acyl-2H-chromenones and Their Imines. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600759] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiang-Suo Meng
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Shan Jiang
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Xiao-Yun Xu
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Qiang-Xian Wu
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| | - Yu-Cheng Gu
- Syngenta Jealott's Hill International Research Centre; Bracknell RG42 6EY Berkshire UK
| | - De-Qing Shi
- Key Laboratory of Pesticide & Chemical Biology; Ministry of Education; College of Chemistry; 152 Luoyu Road 430079 Wuhan, Hubei China
| |
Collapse
|
43
|
Dutta L, Sharma M, Bhuyan PJ. Regioisomeric synthesis of dihydrofuro[2,3-d]pyrimidines in a diastereoselective manner involving nitrogen ylides in one-pot three-component reaction. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.08.084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
44
|
Chelli S, Troshin K, Mayer P, Lakhdar S, Ofial AR, Mayr H. Nucleophilicity Parameters of Stabilized Iodonium Ylides for Characterizing Their Synthetic Potential. J Am Chem Soc 2016; 138:10304-13. [DOI: 10.1021/jacs.6b05768] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Saloua Chelli
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Konstantin Troshin
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Sami Lakhdar
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Armin R. Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, 81377 München, Germany
| |
Collapse
|
45
|
Varshnaya RK, Banerjee P. Construction of Isoxazolidines through Formal [3+2] Cycloaddition Reactions of in situ Generated Nitrosocarbonyls with Donor-Acceptor Cyclopropanes: Synthesis of α-Amino γ-Butyrolactones. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600582] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rohit Kumar Varshnaya
- Department of Chemistry; Indian Institute of Technology Ropar; Nangal Road 140001 Rupnagar Punjab India
| | - Prabal Banerjee
- Department of Chemistry; Indian Institute of Technology Ropar; Nangal Road 140001 Rupnagar Punjab India
| |
Collapse
|
46
|
Chen Q, Mayer P, Mayr H. Ethensulfonylfluorid: der beste je entdeckte Michael-Akzeptor? Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601875] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Quan Chen
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstraße 5-13, Haus F 81377 München Deutschland
| | - Peter Mayer
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstraße 5-13, Haus F 81377 München Deutschland
| | - Herbert Mayr
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstraße 5-13, Haus F 81377 München Deutschland
| |
Collapse
|
47
|
Chen Q, Mayer P, Mayr H. Ethenesulfonyl Fluoride: The Most Perfect Michael Acceptor Ever Found? Angew Chem Int Ed Engl 2016; 55:12664-7. [DOI: 10.1002/anie.201601875] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Quan Chen
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstrasse 5-13, Haus F 81377 München Germany
| | - Peter Mayer
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstrasse 5-13, Haus F 81377 München Germany
| | - Herbert Mayr
- Department Chemie; Ludwig-Maximilians-Universität München; Butenandtstrasse 5-13, Haus F 81377 München Germany
| |
Collapse
|
48
|
|
49
|
|
50
|
|